Rotatable pen



FIG. 1 is a perspective view of a rotatable pen according to my new and ornamental design,

FIG. 2 is a top plan view thereof,

FIG. 3 is a bottom plan view thereof,

FIG. 4 is an elevational side view thereof, an opposite side view being a mirror image; and,

FIG. 5 is an elevational end view thereof, an opposite end view being a mirror image.

The features shown in broken lines in the figures form no part of the claimed design. 

CLAIM The ornamental design for a rotatable pen, as shown and described. 